George f



(No Model.)

G. P. HUTGHINS. SHEDDING MEGHANI$M FOR LOOMS.

Patented Sept IIVVEA/TOR GeorgeFh u/tcfiins A N. PETERS Phmo Lnhographur, wlihhilml. 5. c.

UNITED STATES PATENT OFFICE.

GEORGE E. HUTOIIINS, OF \VORCESTER, MASSACHUSETTS, ASSIGNOR TO THE KNOVLES LOO \VOR-KS, OF SAME PLACE.

SHED DING MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 410,734, dated. September 10, 1889.

Application filed April 6, 1889. Serial No. 306,203 (No model.)

1'0 aZZ whom it may concern; leading from the harness-levers 3 over the ec- Be it known that I, GEORGE F. HUTCHINS, centric or irregular-shaped sheaves 17, correa citizen of the United States, residing at spending to the sheaves S, and pivoted at 18 \Vorcester, in the county of \Vorcester and 011 a stand 19, bolted to the loom-side, and

State of lllEtSSitCllllSGttS, have invented certain thence over the ordinary sheaves 20, sup- 5';

new and useful Improvements in Shedding ported in astand 21 under the harness-frames Mechanism forLooms; and Idohereby declare and to the yokes 22, attached to the harness that the following is a full, clear, and exact deframes.

scription thereof, which, in connection with 23 and ill are ordinary heddles carried by to the drawings making a part of this specificathe harness-frames. tion, will enable others skilled in the art to A portion of the outline of the eccentric or which my invention belongs to make and use irregular-shaped sheaves is circular with the the same. center at the center of the bearing of the My invention relates to the harness mechsheaves. The length of the circular arc is a I 5 anism of looms; and the object of my invenlittle more than the extreme travel of the tion is to so shift the harness-frames and harness-frames, and usually embraces an anheddles that the warp-threads in passing from gle of about one hundred and twenty degrees. one line of the shed to the other do not all The cords to the harness-levers lead off this pass the center at the same time, which obcircular part, and to prevent the sheaves get- 20 jectI attain by the use of eccentric or irreguting out of place the cords are fastened to .lar-shaped sheaves over which the harnessthe sheaves by a rivet or screw 25, Fig. 2, in cords pass between the harness-levers and such a position as not to interfere at any part harness-frames. of the travel with the cords leading off tan- Referring to the drawings, Figure 1 repregent-ially toward the harness-levers.

25 sents a detached portion of a loom with my Points 2b and 27, Fig. 2, on the outline of improvements applied thereto, and Fig. 2 is the sheaves are so taken that the length of a detail of a pair of my improved sheaves. the outline between them is equal to the In the accompanying drawings, 1 is the travel of the harness-frames. The length of arch or elevated portion of a loom-frame, and the radius of point 26 from the center of 0 2 the loom-sides. The full lines 3 represent bearing is as much greaterthan the radius of a the harness-levers, pivoted at 3 and operated pointcentral between 26 and 27 as the radius in any of the ordinary ways, said levers being of point 27 is less than the said central radius.

in the position they occupy when half changed. In strapping up aloom my improved sheaves The dotted lines 1 and 5 show the extreme are put in in pairs in such a way that with 3 5 positions of the harness-levers. the harnessframes at the extremity of their 8 5 6 and '7 are the top harness-cords, leading travel when the cord to one frame leads off from the harness-levers 3 over the eccentric tangentially at point 26 the cord to the comor irregular-shaped sheaves 8, which are suppanion frame leads off tangentially at point ported in the supplemental sheave-stand 0, 27. The effect ofthis is,thatwhenthe harness- 40 which in this instance is of the same 0011- frames are half changed the frames whose struction as the supplemental sheave-stand cords at starting led off the high points 26 of my patent, No. 398,018, and as fully set will be advanced farther than the frames forth in said patent. From the sheaves S the whose cords led off the low points 27 by the cords 6 and 7 pass over the ordinary archdiiference in length of the outline of the high 45 sheaves 10 and 10 to the harnessframes 11 and low points of the eccentric. or irregularand 12. (Shown by full lines in the positions shaped sheaves. The pairs of eccentric or they. occupy when half changed.) The dotted irregular-shaped sheaves are reversed in putlines 13 and 14 show the extreme positions ting on, so that the frames which advance of the harness-frames. faster on the first half of the shift lose the 50 15 and 16 are the bottom harness-cords, same amount on the last half, and all the frames reach the extreme of their travel at the same time. With ordinary sheaves all the harness-frames, part of which may be going up and part going down, meet in the center of their travel, thus making all the warp-threads which are going up on a given pick meet and pass in the center of the shed all the warp-threads which are going down. Each warp-thread in shifting has to pass not only its neighbor threads which are drawn into different harness, but also the heddleeyes which carry its neighbor threads in all the different harness-frames. The effect of this is to cause friction on the warp-threads and consequent breakage, which is greatly augmented with tender yarn and in fine patterns. can be given to a part of the harness-frames and heddles by means of myimproved sheaves is sufficient to greatly relieve this friction.

Instead of carrying the top harness-cords over the supplemental sheaves at the opposite ends of the arch or elevated loom-frame, as shown in the drawings and above described, I can place my eccentric or irregularshaped sheaves in the arches in place of the I have found that the advance which ordinary sheaves 10 and 10 5 but in doing this it would be necessary, in order to have both ends of a given harness-frame travel alike, to keep its two sheaves always at the same point in their revolution.

In the arrangement shown in thedrawings it is necessary to have the eccentric or irregular-shaped sheave at the top set opposite to the eccentric or irregular-shaped sheave for the same frame 011 the bottom, and to avoid the necessity of keeping these in proper adj ustment I may dispense with the bottom cord connections and substitute the springs 28. (Shown by dotted lines, Fig. 1.)

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

The combination, with harness-levers, harness-frames, and cords connecting the same, of eccentric or irregulanshaped sheaves over which the cords pass, substantially as and for the purpose stated.

GEORGE F. IIUTOHINS.

Vitnesses:

- JOHN C. DEWEY,

HENRY H. YOUNG. 

